Easy way to update background color of the panel?

Is there an easy way to update the background color of the panel (the gray background)?

Solution

.fi-main-ctn { @apply bg-red-500 }

.fi-main-ctn { @apply bg-red-500 }

.fi-main-ctn { @apply bg-red-500 }

.fi-main-ctn { @apply bg-red-500 }